Abstract
The effect of nickel salt on growth of the nickel-resistant wild type strain Alcaligenes eutrophus CH34, which harbours two plasmids, and on its partially or totally cured derivatives as well as of the wild type strain H16 was studied. Plasmid pMOL28-mediated nickel resistance turned out to be an inducible property. Full resistance is induced during growth in the presence of 0.03–3.0 mM NiCl2. Induction requires growth. While plasmid-free cells accumulate nickel at a high rate, the pMOL28-harbouring-induced cells accumulate only negligibly small amounts of nickel. It is concluded that pMOL28 mediates a protective mechanism preventing the cells to accumulate nickel ions intracellularly at toxic concentrations.
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